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Equity based compensation (Tables)
 6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of expenses related to share-based payments
The following table highlights the expense related to share-based payments for the three months and six months ended June 30:
 
 
Three months ended June 30,
 
Six months ended June 30,
 
 
2013
 
2012
 
2013
 
2012
Nonvested stock
 
$
54

 
$
54

 
$
136

 
$
108

Stock options
 
64

 
83

 
128

 
230

Stock purchases
 
—

 
215

 
—

 
342

Stock based compensation
 
$
118

 
$
352

 
$
264

 
$
680
Schedule of nonvested stock awards and stock option awards
The following is a summary of nonvested stock awards and stock option awards:
 
 
Nonvested Stock
 
Stock Options
 
 
Number of
shares
outstanding
 
Weighted
average
grant date
fair value
 
Number of
options
outstanding
 
Weighted
average
exercise
price
December 31, 2012
 
396,073

 
$
1.06

 
772,851

 
$
0.97

Granted
 
546,244

 
17.00

 
—

 
—

Vested/exercised
 
(366,854
)
 
0.93

 
(546,244
)
 
0.97

June 30, 2013
 
575,463

 
$
16.27

 
226,607

 
$
0.97